n = int(input("Enter n: "))

for i in range(n):
    for j in range(n - i - 1):
        print(" ", end='')
    for j in range(2 * i + 1):
        print("*", end='')
    print()

for i in range(n - 1):
    for j in range(i + 1):
        print(" ", end='')
    for j in range(2 * (n - i - 1) - 1):
        print("*", end='')
    print()